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adds, that wood fo treated feems to afford ftronger 
appearances than even glafs *. 
The following experiments were made, with the 
affiftance of wood thus prepared. 
Being provided with a large fquare of glals, polifhed 
on both fides, and fixed upright upon one edge, I 
placed, for a conductor, a llender piece of ivory, 
about one foot long, having one end within two 
tenths of an inch from the center of the glafs: at 
the other end were fufpended two fmall balls of 
pith, by threads four inches long. The ivory was 
fupported horizontally by a ftand made of the pre- 
pared wood. When the glafs was made a little warmer 
than the external air, my finger rubbed that fide 
thereof which was fartheft from, and oppofite to, the 
ivory. Upon doing this, the two fides of the glafs 
were electrified plus , as were likewife the balls ; which 
continued plus, even after they were removed from 
the glafs into any part of the room. 
From the appearance of a plus electricity in the 
ivory, as well as on the two fides of the glafs, the 
fluid muff have flowed from the finger into the glafs, 
and part of it into the ivory : otherwife, permit me 
to afk how the ivory fhould be electrified plus ? 
That the fluid really flowed from the finger into 
the glafs, may be inferred from the following expe- 
riment. 
A piece of filver, being fixed upon a flender rod of 
prepared wood, I rubbed the fame glafs with it, as 
I had done before with the finger upon which the 
* See the Abbe Nollet’s Letters upon EleCtridty, published at 
Paris in 1760. 
r filver 
